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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Class to ping an rssCloud endpoint when a feed has been updated
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Plugin
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @copyright 2009 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET')) {
exit(1);
}
/**
* Class for notifying cloud-enabled RSS aggregators that StatusNet
* feeds have been updated.
*
* @category Plugin
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
**/
class RSSCloudNotifier
{
const MAX_FAILURES = 3;
/**
* Send an HTTP GET to the notification handler with a
* challenge string to see if it repsonds correctly.
*
* @param string $endpoint URL of the notification handler
* @param string $feed the feed being subscribed to
*
* @return boolean success
*/
function challenge($endpoint, $feed)
{
$code = common_confirmation_code(128);
$params = array('url' => $feed, 'challenge' => $code);
$url = $endpoint . '?' . http_build_query($params);
try {
$client = new HTTPClient();
$response = $client->get($url);
} catch (HTTP_Request2_Exception $e) {
common_log(LOG_INFO,
'RSSCloud plugin - failure testing notify handler ' .
$endpoint . ' - ' . $e->getMessage());
return false;
}
// Check response is betweet 200 and 299 and body contains challenge data
$status = $response->getStatus();
$body = $response->getBody();
if ($status >= 200 && $status < 300) {
// NOTE: the spec says that the body must contain the string
// challenge. It doesn't say that the body must contain the
// challenge string ONLY, although that seems to be the way
// the other implementors have interpreted it.
if (strpos($body, $code) !== false) {
common_log(LOG_INFO, 'RSSCloud plugin - ' .
"success testing notify handler: $endpoint");
return true;
} else {
common_log(LOG_INFO, 'RSSCloud plugin - ' .
'challenge/repsonse failed for notify handler ' .
$endpoint);
common_debug('body = ' . var_export($body, true));
return false;
}
} else {
common_log(LOG_INFO, 'RSSCloud plugin - ' .
"failure testing notify handler: $endpoint " .
' - got HTTP ' . $status);
common_debug('body = ' . var_export($body, true));
return false;
}
}
/**
* HTTP POST a notification that a feed has been updated
* ('ping the cloud').
*
* @param String $endpoint URL of the notification handler
* @param String $feed the feed being subscribed to
*
* @return boolean success
*/
function postUpdate($endpoint, $feed)
{
$headers = array();
$postdata = array('url' => $feed);
try {
$client = new HTTPClient();
$response = $client->post($endpoint, $headers, $postdata);
} catch (HTTP_Request2_Exception $e) {
common_log(LOG_INFO, 'RSSCloud plugin - failure notifying ' .
$endpoint . ' that feed ' . $feed .
' has changed: ' . $e->getMessage());
return false;
}
$status = $response->getStatus();
if ($status >= 200 && $status < 300) {
common_log(LOG_INFO, 'RSSCloud plugin - success notifying ' .
$endpoint . ' that feed ' . $feed . ' has changed.');
return true;
} else {
common_log(LOG_INFO, 'RSSCloud plugin - failure notifying ' .
$endpoint . ' that feed ' . $feed .
' has changed: got HTTP ' . $status);
return false;
}
}
/**
* Notify all subscribers to a profile feed that it has changed.
*
* @param Profile $profile the profile whose feed has been
* updated
*
* @return boolean success
*/
function notify($profile)
{
$feed = common_path('api/statuses/user_timeline/') .
$profile->id . '.rss';
$cloudSub = new RSSCloudSubscription();
$cloudSub->subscribed = $profile->id;
if ($cloudSub->find()) {
while ($cloudSub->fetch()) {
$result = $this->postUpdate($cloudSub->url, $feed);
if ($result == false) {
$this->handleFailure($cloudSub);
}
}
}
return true;
}
/**
* Handle problems posting cloud notifications. Increment the failure
* count, or delete the subscription if the maximum number of failures
* is exceeded.
*
* XXX: Redo with proper DB_DataObject methods once I figure out what
* what the problem is with pluginized DB_DataObjects. -Z
*
* @param RSSCloudSubscription $cloudSub the subscription in question
*
* @return boolean success
*/
function handleFailure($cloudSub)
{
$failCnt = $cloudSub->failures + 1;
if ($failCnt == self::MAX_FAILURES) {
common_log(LOG_INFO,
'Deleting RSSCloud subcription ' .
'(max failure count reached), profile: ' .
$cloudSub->subscribed .
' handler: ' .
$cloudSub->url);
// XXX: WTF! ->delete() doesn't work. Clearly, there are some issues with
// the DB_DataObject, or my understanding of it. Have to drop into SQL.
// $result = $cloudSub->delete();
$qry = 'DELETE from rsscloud_subscription' .
' WHERE subscribed = ' . $cloudSub->subscribed .
' AND url = \'' . $cloudSub->url . '\'';
$result = $cloudSub->query($qry);
if (!$result) {
common_log_db_error($cloudSub, 'DELETE', __FILE__);
common_log(LOG_ERR, 'Could not delete RSSCloud subscription.');
}
} else {
common_debug('Updating failure count on RSSCloud subscription. ' .
$failCnt);
$failCnt = $cloudSub->failures + 1;
// XXX: ->update() not working either, gar!
$qry = 'UPDATE rsscloud_subscription' .
' SET failures = ' . $failCnt .
' WHERE subscribed = ' . $cloudSub->subscribed .
' AND url = \'' . $cloudSub->url . '\'';
$result = $cloudSub->query($qry);
if (!$result) {
common_log_db_error($cloudsub, 'UPDATE', __FILE__);
common_log(LOG_ERR,
'Could not update failure ' .
'count on RSSCloud subscription');
}
}
}
}
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